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     <dc:title xml:lang="en">Granular materials under stress : a study of discrete plastic events and earthquake-like behaviour</dc:title>
     <dcterms:alternative xml:lang="en">Matériaux granulaires sous contrainte : étude d’événements plastiques discrets et des tremblements de terre à l’échelle du laboratoire</dcterms:alternative>
     <dc:subject xml:lang="fr">Milieux granulaires</dc:subject><dc:subject xml:lang="fr">Tremblements de terre de laboratoire</dc:subject><dc:subject xml:lang="fr">Interférométrie optique</dc:subject><dc:subject xml:lang="fr">Test mécanique</dc:subject>
     <dc:subject xml:lang="en">Granular matter</dc:subject><dc:subject xml:lang="en">Lab scale earthquakes</dc:subject><dc:subject xml:lang="en">Optical interferometry</dc:subject><dc:subject xml:lang="en">Mechanical test</dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
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     <dcterms:abstract xml:lang="fr">Cette thèse explore la déformation de matériaux granulaires à l'aide d'un test biaxial appliqué sur des échantillons de micro-billes de verre. Une méthode d’interférométrie optique permet d’observer la déformation locale dans le matériau. Les expériences montrent que la déformation prend la forme d'évènements plastiques discrets qui sont distribués de façon homogène avant la rupture. Lors de la rupture, la déformation se concentre dans des bandes de cisaillement constituées de ces évènements, reproduisant des phénomènes similaires aux tremblements de terre, comme une distribution de taille en loi de puissance et la présence de répliques.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis investigates the deformation of granular materials using a biaxial test applied to samples of glass microbeads. An optical interferometry method is employed to observe the local deformation within the material. The experiments reveal that the deformation occurs as discrete plastic events, which are homogeneously distributed before failure. At the point of failure, the deformation localizes into shear bands composed of these events, reproducing phenomena similar to earthquakes, such as a power-law size distribution and the occurrence of aftershocks.</dcterms:abstract>
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